The Roughness Render Element bakes the Reflection Roughness values in a scene, creating a grayscale image. To enable Reflection Roughness on a V-Ray Material, its Reflection Glossiness Interpolation needs to be set to Use roughness, then the Reflection Glossiness option turns into Reflection Roughness. Values between 0 and 1 can be entered, the closer to 1 - the whiter the render and the closer to 0 - the darker the render.
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Keep in mind that in order to have Reflection Roughness working, you need to have a Reflection value higher than 0. Otherwise, Reflection Roughness renders incorrectly.
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||out Network|| > V-Ray Render Elements node > V-Ray > V-Ray Color Channel (RE) > Roughness
To turn on Reflection Roughness in a V-Ray Material, go to the Options tab and enable Use Roughness.
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Click here to see how to How to enable Roughness.
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The parameters for this render element appear in the V-Ray RenderChannelColor render channels node.
Deep Output – Specifies whether to include this render element in deep images.
Color Mapping – When enabled, the Color Mapping options in the render settings are applied to the current render channel.
Consider For AA – When enabled, anti-aliasing is used where possible.
